Soft tissue stability after segmental distraction of the anterior mandibular alveolar process: a 5.5 year follow-up

Abstract

Soft tissue changes were analysed retrospectively in 17 patients following distraction osteogenesis (DO) of the mandibular anterior alveolar process. Lateral cephalograms were traced by hand, digitized, superimposed, and evaluated at T1 (17.0 days), after DO at T2 (mean 6.5 days), at T3 (mean 24.4 days), at T4 (mean 2.0 years), and at T5 (mean 5.5 years). Statistical analysis was carried out using Kolmogorov-Smirnov test, paired t-test, Pearson's correlation coefficient, and linear backward regression analysis. 5.5 years postoperatively, the net effect for the soft tissue at point B' was 88% of the advancement at point B while the lower lip (labrale inferior) followed the advancement of incision inferior to 24%. Increased preoperative age was correlated (p<0.05) with more horizontal backward movement (T5-T3) for labrale inferior and pogonion'. Higher NL/ML' angles were significantly correlated (p<0.05) to smaller horizontal soft tissue change at labrale inferior (T5-T3). The amount of advancement at point B was significantly correlated with an upward movement (T5-T3) of labrale inferior (p<0.01) and stomion inferior (p<0.05). It can be concluded that further change in soft tissues occurred between 2.0 and 5.5 years postoperatively. The physiological process of ageing and loss of soft tissue elasticity should be considered as possible reasons

Accuracy of 3 Soft Tissue Prediction Methods After Double-Jaw Orthognathic Surgery in Class III Patients

“…10,15,[18][19][20] In studies using cephalometric measurements, various reference planes were used to examine vertical and horizontal changes. 1,[20][21][22][23][24][25][26][27][28][29] Frequently used ones among these planes are Sella Nasion plane or the plane ±7 degrees angled to this plane 10,11,19,20,24,25,[30][31][32][33] and Frankfort horizontal 9,15,34 as the horizontal reference plane, and the planes drew from Nasion or Sella point to these planes as the vertical plane. 9,10,15,19,24,25,30,32,34 Frankfort horizontal was selected as an HRL, and the perpendicular to the HRL through the Porion point was taken vertical reference line.…”

Anterior Mandibular Segmental Distraction Osteogenesis: A Case Report

“…The long-term soft tissue changes after AMSDO using a tooth-borne distraction device disclosed that the net effect of the soft tissue at point B is 88% of the total skeletal advancement at point B and the lower lip followed the advancement of incision inferior to 24% after 5.5 years [ 4 ]. The authors concluded that the physiological process of aging and loss of soft tissue elasticity should be considered as a reason for the soft tissue changes over time [ 4 , 6 ].…”

Réflechir, rechercher, innover en chirurgie maxillo-faciale. Entretien avec Albino Triaca

“…On peut parfois éviter les extractions en envisageant le traitement autrement (Fig. 10) grâce à la distraction antéropos-térieure du segment frontal qu'elle soit maxillaire ou mandibulaire [4][5][6]9] (Figs. 11a, 11b) mais égale-ment grâce à la distraction transversale maxillaire (Fig.…”